James Grahn wrote:
Hey John Evans. How much slower did your bird stall with the Kleber tips?
Might be a player, but certainly not 20kts.
Cubes
Might be a player, but certainly not 20kts.
Cubes
My T-18 stalled at 54-55 mph with 2 notches of flaps (approx. 20 deg.?). That was at around 1500#. It had (has) the "standard" wing, with Sunderland airfoil, and was eventually 968# empty - it was lighter at first, but gained quite a few pounds (about 30) in 28 years. They did make a small difference in the stall... I'm sorry that I don't have any firm numbers. They also resulted in considerably more ground effect, resulting in slower touch down speeds. I did flight tests when I built them, installing one on the left wing and leaving the original Thorp tip on the right. A considerable amount of left stick was necessary to overcome increased lift. The stick force was measured with a spring scale, but I don't remember what it was anymore - I documented all of that, but can't find it now... drives me crazy. Some of it may be in the old newsletters. I had a good amount of time in the bird before installing them, and then somewhat over 1000 hours with them. I loved the feel of them on my T-18.
